Lecture 23

# Lecture 23 - Test 2 Score Histogram (Average=58) Physics...

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1 Physics 231 General University Physics Spring 2007 Lecture 23 Test 2 Score Histogram (Average=58) ± Combined average of Test 1 and 2 ± > 79 ---> A ± 79--65 ---> B ± 64 --45 ---> C ± 44 -- 34 ---> D ± < 34 ---> E Histogram 0 5 10 15 20 25 30 35 1 0 3 50 70 9 Mor e 0 Frequency Frequency Last Meeting ± Center of Mass Today ± Kinematics of Rotation Rigid Object ± A rigid object is one that is nondeformable ² The relative locations of all particles making up the object remain constant ² All real objects are deformable to some extent, but the rigid object model is very useful in many situations where the deformation is negligible

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2 Angular Position ± Axis of rotation is ² through the center of the disc ² Perpendicular to page ± Choose a fixed reference line ² e.g. x-axis ± Point P is at a fixed distance r from the origin Angular Position (cont.) ± Point P will rotate about the origin in a circle of radius r ± Every particle on the disc undergoes circular motion about the origin, O ± Polar coordinates are convenient to use to represent the position of P (or any other point) ± P is located at ( r , θ ) where r is the distance from the origin to P and is the measured counterclockwise from the reference line Angular Position (cont.) ± As the particle moves, the only coordinate that changes is θ ± As the particle moves through θ , it moves though an arc length s . ± s = r θ ² Simplest choice ² θ measured in radians ² Full circle: 2 π r=r θ so θ =2 π r s s Angular Position (cont.) ±
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## This note was uploaded on 11/16/2010 for the course PHY 231 taught by Professor Ellis during the Spring '08 term at Kentucky.

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Lecture 23 - Test 2 Score Histogram (Average=58) Physics...

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